<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    body{
      background-color: #966;
    }
    .div1{
      margin: 15px;
      background-color: #ccf;
      width: 200px;
      height:200px;
      float: left;
    }
    .div2{
      text-align: right;
      width: 200px;
      height:200px;
      background-color: red;
      float: right;
    }
    .div3{
      width: 100%;
      height:200px;
      background-color: blue;
      float: left;
    }
  </style>
</head>
<body>
  <div class="div1">
    <h2>第一块div</h2>
    <ul>
      <li>sdfwerwerwe</li>
      <li>werwer</li>
      <li>werwer</li>
      <li>werwer</li>
      <li>werwerer</li>
    </ul>
  </div>
  <div class="div2">werrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrwer</div>
  <div class="div3"></div>
</body>
</html>
